Taira Capeta was a fourth-grade boy. He had lost his mother when he was very young. Although he pretended to be tough in front of his father, he actually felt lonely. One day, his father brought junk parts home from his workplace and built a racing cart. Soon, they went to a circuit to drive the cart. However, Capeta found that its frame was bent and it could hardly run straight. But, with his technique, he managed the cart. Furthermore, he followed closely behind the fast cart and could nearly leave it behind. The driver in the cart was Minamoto Naomoi, the champion of the East Japan Junior Cart. Looking at their chase, Naomi’s mother, Minamoto Nanako, advised Capeta to take part in the official race.